石英称重传感器的输出信号中的温度漂移噪声是一阶或一阶以上连续的，而称重激励信号的变化是离散的。
In the output signals of quartz weighing sensor, the temperature drift noise is first order or over first order continuous, however, the weighing exciting signal is discrete.
这些方法的精度都局限在一阶截断误差，在离散的网格上有严重的累积误差。
But all their precisions are limit to one-order truncation error, and make severe accumulate error on discrete models.
另一方面讨论了随机利率下的一些离散年金、连续年金和连续生存年金现值随机变量的一阶和二阶原点矩及其方差。
On the other hand, the moment, the second moment and variance of the present value random variables about some life annuities and annuities with random interest rate are gotten.
对浓度方程在时间上进行了一阶和二阶离散，采用间断有限元格式；
The first order and the second order of fully discrete discontinuous finite element schemes are proposed for the concentration equation.
从锥壳理论出发，导出计算旋转壳自由振动的一阶微分方程组，采用离散变量法进行求解。
From the theory of conical shells, a set of the first-order differential equations for the shells of revolution are derived. The discrete-variable method is used to solve the differential equations.
对于高阶离散混沌系统也可以采用上面的变换将系统降阶，变成一阶差分方程组进行求解，从而离散混沌系统都可以通过简单的编程实现数值仿真。
Then for higher order chaotic discrete-time system, the approach discussed can be degraded to one order difference equation. As a result, chaotic discrete-time system can be easily solved by Matlab.
对于高阶离散混沌系统也可以采用上面的变换将系统降阶，变成一阶差分方程组进行求解，从而离散混沌系统都可以通过简单的编程实现数值仿真。
Then for higher order chaotic discrete-time system, the approach discussed can be degraded to one order difference equation. As a result, chaotic discrete-time system can be easily solved by Matlab.
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